Like 49f7ab, I am looking for an addon that can permanently colour individual tabs (inactive or active, and nothing else) with custom colours - like colorful tabs used to but no longer does - like Tab ReTitle can rename tabs permanently.

Tree Tabs has customisable colours, borders and more for tabs by function, if you want that AnthonyH. The ability to permanently custom colour individual tabs is the only thing missing.

Could you do that dev?